June Allyson was first cast in the role of Ellen, but became pregnant. Judy Garland was cast next, but MGM terminated her studio contract. Moira Shearer was considered for the role of Anne. The story was loosely based on the real-life partnership of Fred Astaire and his sister, Adele Astaire. The ship's rocking during "Open Your Eyes" was based on the Astaires' own dancing experience on a voyage to London in 1923. A boat-rocking device was used to create the film effect. The ...[Read Story ]